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@ 2014-06-10T12:28:42Z

<?php

$key = "[[question(8)]]";

$questionID = preg_replace( '/[^0-9]/', '', $key );

print_r( $questionID );

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

40.76 ms | 402 KiB | 5 Q